EP4378650A1 - Procédé de fabrication d'osb et dispositif de fabrication d'osb - Google Patents

Procédé de fabrication d'osb et dispositif de fabrication d'osb Download PDF

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Publication number
EP4378650A1
EP4378650A1 EP22211013.2A EP22211013A EP4378650A1 EP 4378650 A1 EP4378650 A1 EP 4378650A1 EP 22211013 A EP22211013 A EP 22211013A EP 4378650 A1 EP4378650 A1 EP 4378650A1
Authority
EP
European Patent Office
Prior art keywords
flame retardant
layer
chips
osb
chip
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP22211013.2A
Other languages
German (de)
English (en)
Inventor
Joachim Hasch
Norbert Kalwa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Swiss Krono Tec AG
Original Assignee
Swiss Krono Tec AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Swiss Krono Tec AG filed Critical Swiss Krono Tec AG
Priority to EP22211013.2A priority Critical patent/EP4378650A1/fr
Publication of EP4378650A1 publication Critical patent/EP4378650A1/fr
Pending legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N1/00—Pretreatment of moulding material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N1/00—Pretreatment of moulding material
    • B27N1/02—Mixing the material with binding agent
    • B27N1/029—Feeding; Proportioning; Controlling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
    • B27N3/02—Manufacture of substantially flat articles, e.g. boards, from particles or fibres from particles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
    • B27N3/08—Moulding or pressing
    • B27N3/10—Moulding of mats
    • B27N3/14—Distributing or orienting the particles or fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
    • B27N3/08—Moulding or pressing
    • B27N3/18—Auxiliary operations, e.g. preheating, humidifying, cutting-off
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N9/00—Arrangements for fireproofing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N1/00—Pretreatment of moulding material
    • B27N1/02—Mixing the material with binding agent
    • B27N1/0218—Mixing the material with binding agent in rotating drums

Definitions

  • the invention relates to a method for producing, in particular, flame-retardant OSB (oriented strand board), which can also be referred to as chipboard.
  • OSB oriented strand board
  • flame retardants themselves are expensive.
  • flame retardants mean that more glue has to be used to achieve the same mechanical strength as a non-flame-retardant OSB board, which is also undesirable.
  • most flame retardants are poorly soluble in water, so that introducing the flame retardant into the chips also introduces large amounts of water, which often have to be removed during further processing.
  • the invention is based on the object of improving the production of flame-retardant wood-based panels, in particular OSB.
  • the invention solves the problem by a method for producing OSB with the steps (a) producing coarse chips, (b) applying glue to the coarse chips so that glued coarse chips are formed, (c) arranging the glued coarse chips on a conveyor belt so that a chip layer is formed, (d) applying a flame retardant liquid to this chip layer and (e) pressing the chip layer so that the OSB board is formed.
  • the invention solves the problem of a method for producing wood-based panels with the steps (a) producing chips, (b) applying glue to the chips so that glued chips are produced, (c) arranging the glued chips on a conveyor belt so that a chip layer is produced, (d) applying a flame retardant liquid to this chip layer and (e) pressing the chip layer so that the wood-based panel is produced.
  • coarse chips are mentioned below, normal chips that are not coarse chips are also meant within the scope of this most general form of the invention.
  • the invention solves the problem by a generic OSB manufacturing device which has (a) a first flame retardant liquid application device which is arranged to apply a flame retardant liquid to the first cover layer, and (b) a second flame retardant liquid application device which is arranged to apply a flame retardant liquid to the second cover layer.
  • the invention solves the problem by a wood-based panel manufacturing device with (a) a chip manufacturing device for producing chips from wood, (b) a dryer for drying the chips, which is connected to the coarse chip manufacturing device, (c) a belt conveyor arranged behind the dryer in the material flow direction, (d) a first distribution device for distributing chips on the belt conveyor so that a first cover layer is formed, (e) a second distribution device for distributing chips so that a second cover layer is formed above the first cover layer so that a chip layer is formed (d) a press for pressing the chip layer into an OSB board, (e) a first flame retardant liquid application device arranged to apply a flame retardant liquid to the first cover layer, and (d) a second flame retardant liquid application device, which is arranged to apply a flame retardant liquid to the second cover layer.
  • OSB Japanese Industrial Standard
  • wood-based panels are generally meant within the scope of this most general form of the invention; when a coarse chip production device is mentioned, a chip production device is generally
  • this distance is less than 30 m. This reduces the amount of OSB that has a sufficiently high flame retardant content, particularly when starting up or changing to the production of flame-retardant OSB. In this way, flame-retardant OSB and non-OSB can also be produced using the same OSB production device. Furthermore, the reaction time between glue and flame retardant or the water in the flame retardant is shortened.
  • coarse chips are understood to mean in particular wood chips which are in the size range 200 ⁇ 30 cm x 20 ⁇ 4 cm x 0.5 ⁇ 0.2 cm.
  • the flame retardant liquid is preferably an aqueous solution.
  • the flame retardant liquid preferably contains at least one organic or inorganic phosphorus-containing and/or nitrogen-containing compound.
  • the flame retardant is preferably boron-free.
  • Pressing is understood to mean pressing using a belt press.
  • the press is preferably a belt press.
  • the flame retardant liquid is understood to mean in particular a solution, emulsion or dispersion which contains flame retardants in a liquid phase, in particular a solvent.
  • the distribution of coarse chips on the belt conveyor is understood in particular to mean the distribution of the coarse chips on a conveyor belt of the belt conveyor.
  • the middle layer chips are also coarse chips.
  • the middle layer chips have a length distribution density, whereby the length distribution density indicates the number of coarse chips with a certain length.
  • the length distribution density preferably has a middle layer chip length median that is smaller than a top layer chip length median of the length distribution density of the top chips. In other words, the chips that form the top layers are longer than the chips that form the middle layer.
  • the method comprises the steps of (a) detecting a moisture content of the OSB and/or the chip layer after application of the flame retardant and (b) changing an application amount of flame retardant liquid and/or a flame retardant concentration of flame retardant in the flame retardant liquid so that the chip layer moisture content is within a predetermined target moisture content interval and a flame retardant content of the chip layer and/or the OSB is within a predetermined target flame retardant content interval.
  • the method preferably comprises the steps of (a) detecting a top layer moisture content of the first top layer and/or the second top layer after application of the flame retardant and (b) changing the application amount of flame retardant liquid and/or the flame retardant concentration of the flame retardant in the flame retardant liquid so that the top layer moisture content lies in a predetermined target top layer moisture content interval.
  • the reduction of the flame retardant concentration is carried out, for example, by adding solvent, in particular water, to the flame retardant liquid.
  • the increase of the flame retardant concentration is carried out, for example, by reducing the addition of solvent.
  • the increase of the flame retardant concentration can comprise increasing the temperature of the flame retardant liquid if - as according to a preferred embodiment intended - the flame retardant is present at its saturation concentration in the flame retardant liquid.
  • the solvent is passed through a bath of solid flame retardant. The higher the temperature of the solvent, the higher the flame retardant concentration.
  • the chip layer has a chip layer temperature
  • the top layer has a top layer temperature
  • the middle layer has a middle layer temperature.
  • These temperatures refer to a position in the direction of material flow immediately before the point where the flame retardant liquid is applied. In each case, they are the average temperature over the full width of the respective layer.
  • the temperature of the flame retardant liquid and the flame retardant concentration are selected such that cooling the flame retardant liquid to the respective temperature (chip layer temperature, top layer temperature or middle layer temperature) results in the flame retardant content at this temperature being below the solubility of the flame retardant. In this way, little solvent is introduced into the corresponding layer.
  • the flame retardant liquid When applied to the respective layer, the flame retardant liquid preferably has a temperature of at least 50°C, in particular at least 60°C, preferably 70°C, particularly preferably at least 80°C.
  • a high temperature generally increases the solubility of the flame retardant in the solvent, so that less solvent, usually water, is required to dissolve a given amount of flame retardant.
  • the viscosity of water decreases with increasing temperature, so that the flame retardant liquid can penetrate the coarse chips more easily.
  • the flame retardant liquid contains a concentration of flame retardant that corresponds to at least 60%, in particular at least 70%, preferably at least 80%, particularly preferably at least 90%, of the maximum solubility of the flame retardant at the corresponding temperature.
  • a concentration of flame retardant that corresponds to at least 60%, in particular at least 70%, preferably at least 80%, particularly preferably at least 90%, of the maximum solubility of the flame retardant at the corresponding temperature.
  • the heated flame retardant causes the two cover layers to experience a temperature increase, which enables a higher press speed.
  • the flame retardant liquid contains a viscosity reducer, in particular a surfactant. This allows the flame retardant liquid and thus the flame retardant to penetrate the chips more quickly.
  • the flame retardant liquid preferably contains a viscosity reducer.
  • the method comprises the step of applying a pressure difference to the chip layer, cover layer or middle layer that is or will be wetted with flame retardant liquid.
  • the application of the pressure difference can comprise applying a negative pressure, in particular to an underside of the belt conveyor on an upper side of the chip layer, cover layer or middle layer.
  • the advantage of this is that the consumption of flame retardants can generally be reduced compared to conventionally produced OSB.
  • the flame retardant liquid is at least partially absorbed into the coarse chips. This means that there is less of a crust of flame retardants forming on the coarse chips. If the flame retardant at least partially penetrates the coarse chips, its effectiveness is increased.
  • the amount of glue therefore needs to be increased significantly less to compensate for a loss of strength caused by the addition of the flame retardant.
  • the creation of the pressure difference by applying excess pressure is understood in particular to mean that a pressure difference is generated between a first side surface of the coarse chips and the opposite side surface of the coarse chips.
  • the two side surfaces are spaced apart by the height of the coarse chips, which is preferably 0.5 ⁇ 0.2 cm.
  • the application of the pressure difference by applying negative pressure is understood in particular to mean that a pressure is applied to the coarse chips, in particular to the covering layer, which is at least 200 hPa, preferably at least 400 hPa, particularly preferably at least 600 hPa, lower than the ambient pressure.
  • Gluing is preferably carried out without a pressure difference applied to the coarse chips.
  • the negative pressure is applied to the underside of a conveyor belt of the belt conveyor.
  • the conveyor belt is gas-permeable for this purpose.
  • the conveyor belt is perforated or made of a gas-permeable material, such as a textile.
  • the conveyor belt can be a metal belt. This metal belt is preferably perforated.
  • the overpressure is applied, for example, by the layer first passing a roller that acts as a seal and then entering an overpressure area in which the overpressure is present.
  • the layer lies on a gas-permeable conveyor belt, on the side of which facing away from the overpressure area there is a lower pressure, for example ambient pressure or negative pressure.
  • the layer leaves the overpressure area by passing a roller that acts as a seal.
  • the coarse chips are dried until they are kiln-dry. In this state, flame retardant liquid is absorbed particularly easily and quickly by the dried coarse chips. According to a preferred embodiment, the coarse chips containing flame retardant are not dried significantly. This is to be understood in particular that the moisture content of the respective layer (top layer, middle layer or chip layer) changes by a maximum of five percentage points, in particular by a maximum of two percentage points, after the flame retardant liquid has been applied.
  • the coarse chip layer has a chip layer thickness that is at most four times, preferably at most three times, preferably at most twice, the thickness of a coarse chip layer of a single coarse chip layer.
  • the coarse chip layer thickness is the minimum achievable thickness of a coarse chip layer. This is the average height of an arrangement of coarse chips on a flat, horizontal test surface of 1 m 2 , whereby for this arrangement, the following applies: on a maximum of 75% of the test area has sections of two or more coarse chips lying on top of each other and at least 90%, preferably at least 95%, in particular 100%, of the test area being covered by coarse chips.
  • the flame retardant liquid preferably contains a dye.
  • This dye is preferably colorless in the visible range.
  • the dye can also be referred to as a marker. It is advantageous if the dye absorbs and/or fluoresces in the UV range.
  • a flame retardant distribution of the flame retardant liquid and/or the flame retardant can be recorded by irradiating with UV light and/or taking an image of the respective layer and/or the OSB board with a camera sensitive to the UV range.
  • a process parameter in the form of the conveyor belt speed and/or the pressure difference and/or an area-specific application rate of flame retardant liquid is regulated based on the flame retardant distribution.
  • a deviation between a target flame retardant distribution and the respective measured actual flame retardant distribution is determined and at least one of the parameters mentioned is regulated so that the deviation is minimized.
  • An OSB manufacturing device preferably has a third distribution device for distributing chips so that a middle layer is created above the first cover layer.
  • the third distribution device is designed so that the middle layer lies on the first cover layer.
  • the second distribution device is then preferably designed so that the second cover layer lies on the middle layer. Accordingly, the second distribution device is preferably arranged behind the third distribution device in the direction of material flow.
  • the OSB production device preferably has a hopper which is arranged in the material flow direction behind the coarse chip production device and preferably behind a dryer for the coarse chips.
  • the hopper is preferably arranged in the material flow direction before the distribution devices. In other words The distribution devices distribute glued chips.
  • the hopper is preferably a rotating gluing drum or a mixer, in particular a trough mixer.
  • the OSB production device preferably has a classifier for separating top layer chips and middle layer chips.
  • the classifier is preferably a sifter. It is advantageous if the classifier is arranged behind the coarse chip production device and/or in front of the bucket in the direction of material flow.
  • the pressure difference generator for applying the pressure difference to the chip layer preferably comprises a vacuum generator and/or a pressure generator.
  • the differential pressure generator preferably has a vacuum pump and at least one suction chamber, preferably at least two suction chambers, in particular a plurality of suction chambers, each of which is connected to the vacuum pump via a valve.
  • the valves are preferably designed to increase their valve opening degree as the pressure in the suction chamber decreases. In other words, the valves open further the lower the pressure in the respective suction chamber.
  • the suction chambers are arranged in particular in such a way that at least 90% of the surface, preferably at least 95% of the surface, particularly preferably 100% of the surface of the coarse chipping system can be subjected to the pressure difference, in the present case to a negative pressure, for at least a predetermined time of, for example, 1 second, in particular at least 5 seconds, by means of at least one suction chamber.
  • a negative pressure is at least 300 hPa (and the pressure is therefore 713 hPa), in particular at least 500 hPa (and the pressure is therefore 513 hPa).
  • the OSB manufacturing device has an inspection system for detecting the flame retardant distribution in the respective layer.
  • This can be the distribution of the flame retardant in the surface of the coarse chip layer, i.e. the two-dimensional distribution in the length and width direction of the coarse chip layer, but not in the thickness direction.
  • the inspection system can be designed to detect the flame retardant distribution in the OSB. This can then be the distribution of the flame retardant in the surface of the OSB, i.e. the two-dimensional distribution in the longitudinal direction and width direction of the coarse chip layer, and/or the distribution of the flame retardant in the thickness direction.
  • the inspection system preferably has a camera for capturing UV light and/or fluorescent light that is generated when the coarse chip layer or the OSB is irradiated with UV light.
  • the inspection system preferably also has a UV light source for irradiating the coarse chip layer or the OSB with UV light.
  • the OSB production device preferably comprises a moisture meter for measuring a moisture content of a chip layer, in particular the first cover layer and/or the second cover layer.
  • the moisture meter is preferably designed for spatially resolved measurement of the moisture content of the chip layer.
  • This moisture meter can, for example, comprise an infrared light source and an infrared camera.
  • the infrared light source is preferably designed to emit infrared radiation with a wavelength of 3 ⁇ 0.5 ⁇ m. In this wavelength range, water absorbs the infrared light particularly strongly and reflects it correspondingly very little.
  • the OSB production device has a control system which is designed to automatically control the first flame retardant liquid application device and/or the second flame retardant liquid application device to change an application amount of flame retardant liquid and/or a concentration of the flame retardant, so that the chip layer moisture content is in a predetermined target moisture content interval and a flame retardant content of the chip layer and/or the OSB is in a predetermined target flame retardant content interval.
  • At least one of the flame retardant liquid application devices has at least two, in particular a plurality of, nozzles that can be individually controlled by the control system.
  • the control system is then designed to control the nozzles of the flame retardant liquid application device so that the actual spatial distribution of the flame retardant is limited by a predetermined Target distribution, in particular a spatially constant concentration of flame retardant, deviates as little as possible.
  • the flame retardant liquid application device preferably comprises a temperature control which is designed to automatically set a target temperature and/or a concentration control for setting a target concentration of flame retardant in the solvent.
  • the solvent is preferably water.
  • the saturation concentration of the flame retardant in the water can be set by the temperature. If - as provided according to a preferred embodiment - the flame retardant application device is set up to apply a flame retardant liquid whose concentration of flame retardant corresponds to the saturation limit, the concentration of flame retardant can be increased by increasing the temperature.
  • FIG. 1 shows schematically a wood-based panel manufacturing device according to the invention, here in the form of an OSB manufacturing device 10, which has a chip manufacturing device, here in the form of a coarse chip manufacturing device 12, which first debarks wood 14 in a debarker 16 and then chips it in a chipper 18 to form chips, here in the form of coarse chips 20.
  • the chips 20 are dried in a dryer 22, preferably until they are kiln-dry.
  • top chips 26 are separated from middle layer chips 28.
  • the middle layer chips are smaller, in particular shorter, than the top chips 26.
  • a bin 30 for example a rotating gluing drum or a mixer, in particular a trough mixer, which in the present case has a top layer chip gluing unit 30a and a middle layer chip gluing unit 30b, which glue the top chips 26 and the middle layer chips 28 respectively.
  • Cover chips 26, which can also be referred to as cover layer chips, are scattered by a first distribution device 32.1 to form a first cover layer 34.1.
  • a first flame retardant liquid application device 36.1 is used to apply a schematically drawn flame retardant liquid 38 to the first cover layer 34.
  • Cover chips 26 are also scattered by a second distribution device 32.2 to form a second cover layer 34.2.
  • a schematically drawn flame retardant liquid 38 is applied to the first cover layer 34 by means of a second flame retardant liquid application device 36.2.
  • a schematically drawn flame retardant liquid 38 is applied to the second cover layer 34.2.
  • Middle layer chips 38 are spread onto the first cover layer 4 30.1 by means of a third distribution device 32.3, so that they form a middle layer 40. It is possible, but not necessary and in the Figure 1 In the embodiment shown, it is not provided that flame retardant 38 is applied to the middle layer by means of a flame retardant liquid application device.
  • the first cover layer 34.1, the middle layer 40 and the second cover layer 34.2 together form a chip layer 42, which is pressed into an OSB 46 by means of a hot press 44.
  • FIG 2 shows a schematic view of the OSB manufacturing device 10 in a side view.
  • the flame retardant liquid application devices 36.1, 36.2 have together or - as in Figure 1 shown - a reservoir 50.1, 50.2 in which the flame retardant liquid 38 is contained.
  • a heater 52.1, 52.2 the flame retardant liquid 38 can be brought to a predetermined temperature T 28 , for which, for example, 50°C ⁇ T 28 ⁇ 95°C applies.
  • the OSB production device 10 can have a pressure difference generator 58, which is designed to apply a pressure difference to the first cover layer 34.1. This creates coarse chips 20 containing flame retardant.
  • a pressure p j of, for example, 100 hPa ⁇ p j ⁇ 800 hPa is therefore present at the suction chambers 62.j. It is possible that the pressures in the individual suction chambers 62.j differ from one another. Valves not shown can be used for this purpose.
  • the suction chambers 62.j are located on a conveyor belt 64, in particular a metal belt, of a belt conveyor 66, which has openings, for example holes. As a result, the pressure p j is applied to the first cover layer 34.1.
  • a first inspection system 70.1 can be arranged behind the pressure difference generator 58 in the material flow direction M, which has a camera 72.1.
  • the camera 72 detects light that is reflected, emitted and/or not absorbed by a dye in the flame retardant liquid 38.
  • the camera 72.1 detects fluorescent light.
  • an actual flame retardant distribution k ist (x,y) is determined, which indicates a concentration k of flame retardant depending on the area coordinates x, y.
  • the camera 72.1 can be used as a moisture meter and measure the moisture distribution in the covering layer 34.1 using reflected or absorbed IR light.
  • a control 74 compares the actual flame retardant distribution k ist (x,y) with a target flame retardant distribution k soll (x,y) and controls the nozzles 56.k individually so that a deviation between the actual flame retardant distribution k ist (x,y) and the target flame retardant distribution k soll (x,y) is minimized.
  • the inspection system prefferably has a UV light source 76.1 that illuminates the cover layer 22 in a field of view G of the camera 72.1.
  • the field of view G is the area of the cover layer 34.1 that is recorded by the camera 72.
  • Figure 1 shows that - regardless of other features of this embodiment - a cutting device 78 can be arranged behind the hot press 44 in the material flow direction, which cuts the OSB board 46 into individual board segments 80.I.
  • a second inspection system 82 see Figure 3
  • camera 84 records a cut surface 86 of the respective plate segment 80.I.
  • a second actual flame retardant distribution k ist,2 (y,z) is determined, which also encodes the depth dependence of the concentration k of flame retardant.
  • the second actual flame retardant distribution k ist,2 (y,z) encodes a depth profile of the dye.
  • the control 74 is designed to change the pressures p j in the at least one suction chamber 60.j and/or a conveyor belt speed v 62 of the conveyor belt 62, so that the second actual flame retardant distribution k ist,2 (y,z) approaches a second target flame retardant distribution k soll,2 (y,z).

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Dry Formation Of Fiberboard And The Like (AREA)
EP22211013.2A 2022-12-02 2022-12-02 Procédé de fabrication d'osb et dispositif de fabrication d'osb Pending EP4378650A1 (fr)

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Application Number Priority Date Filing Date Title
EP22211013.2A EP4378650A1 (fr) 2022-12-02 2022-12-02 Procédé de fabrication d'osb et dispositif de fabrication d'osb

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Application Number Priority Date Filing Date Title
EP22211013.2A EP4378650A1 (fr) 2022-12-02 2022-12-02 Procédé de fabrication d'osb et dispositif de fabrication d'osb

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EP4378650A1 true EP4378650A1 (fr) 2024-06-05

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3438847A (en) * 1965-02-26 1969-04-15 Weyerhaeuser Co Process of treating composite boards with borate chemicals produced thereby and product
US20040028934A1 (en) * 2000-04-14 2004-02-12 Preston Alan F. Methods of incorporating treatment agents into wood based composite products
WO2015061905A1 (fr) * 2013-10-31 2015-05-07 Blh Technologies Inc. Article résistant au feu, et procédé de production associé
EP3181313A1 (fr) * 2015-12-18 2017-06-21 SWISS KRONO Tec AG Procede d'application d'un liquide sur un substrat, en particulier sur des couches de fibres et dispositif de fabrication de panneau en bois
EP3470191A1 (fr) * 2017-10-16 2019-04-17 SWISS KRONO Tec AG Procédé et dispositif destinés à la fabrication d'une plaque en matériau dérivé du bois
US20200181448A1 (en) * 2018-08-22 2020-06-11 Polymer Solutions Group Fine particle size boric acid/urea dispersion, method of use in engineered wood product manufacture, method of coating wood products and product therefrom

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3438847A (en) * 1965-02-26 1969-04-15 Weyerhaeuser Co Process of treating composite boards with borate chemicals produced thereby and product
US20040028934A1 (en) * 2000-04-14 2004-02-12 Preston Alan F. Methods of incorporating treatment agents into wood based composite products
WO2015061905A1 (fr) * 2013-10-31 2015-05-07 Blh Technologies Inc. Article résistant au feu, et procédé de production associé
EP3181313A1 (fr) * 2015-12-18 2017-06-21 SWISS KRONO Tec AG Procede d'application d'un liquide sur un substrat, en particulier sur des couches de fibres et dispositif de fabrication de panneau en bois
EP3470191A1 (fr) * 2017-10-16 2019-04-17 SWISS KRONO Tec AG Procédé et dispositif destinés à la fabrication d'une plaque en matériau dérivé du bois
US20200181448A1 (en) * 2018-08-22 2020-06-11 Polymer Solutions Group Fine particle size boric acid/urea dispersion, method of use in engineered wood product manufacture, method of coating wood products and product therefrom

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